Lyons, John
Cambridge University Press, 1991
eBooks
Langacker, Ronald W.
Harcourt, Brace & World, 1968
Buku Teks SO
Fabb, Nigel
Camridge University Press , 2002
Buku Teks SO
Moulton, William G.
Modern Language Association of America, 1966
Buku Teks SO
edited by Thomas A. Sebeok
Mouton, 1971
Buku Referensi